Equilibrium: If the sum of the external torques on an object is zero, then the sum of the external forces on it must also be zero.
A. True
B. False
Answer: B
Physics & Space Science
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What will be an ideal response?
Physics & Space Science
Which law explains why a skater can spin faster by pulling his arms closer to his body, or spin slower by spreading his arms out?
A) the law of gravity B) Newton's third law of motion C) the law of conservation of momentum D) the law of conservation of angular momentum E) the law of conservation of energy
Physics & Space Science
A star's position along the horizontal axis of an H-R diagram tells us all of the following except the star's
A) radius. B) spectral type. C) surface temperature. D) surface color.
Physics & Space Science
A ______________ is an ultra-hot collection of electrically charged particles
a. gas b. liquid c. plasma d. solid
Physics & Space Science